如何获取地形Teerain的几何信息（geometricInfo）？

Creator 3.x
#1

各位好，引擎中似乎没有返回的地形的几何信息（geometricInfo）？我正在尝试对地形添加第三方物理库的支持，比如射线检测或者其他法向、面信息拓展等等，创建的其他内建模型或导入外部网格貌似都有这个数据。但地形我没有找到类似的字段，是否有方法可以在场景上支持获取地形（Teerain）的以下数据？
IGeometricInfo：
positions: new Float32Array(),
indices: new Uint8Array(),
boundingBox: { min: Vec3.ZERO, max: Vec3.ZERO },

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#2

找到了，从其他引擎搬运过来的。

    getIndices (size){
        let indices=[]
        let subdivisionsX=size.width
        let subdivisionsY=size.height
        for (let row = 0; row < subdivisionsY; row++) {
          for (let col = 0; col < subdivisionsX; col++) {
              indices.push(col + 1 + (row + 1) * (subdivisionsX + 1));
              indices.push(col + 1 + row * (subdivisionsX + 1));
              indices.push(col + row * (subdivisionsX + 1));

              indices.push(col + (row + 1) * (subdivisionsX + 1));
              indices.push(col + 1 + (row + 1) * (subdivisionsX + 1));
              indices.push(col + row * (subdivisionsX + 1));
            }
        }
        return indices;
      }

      getPositions(size){
        let positions=[]
        for (let j = 0; j < size.height+1; ++j) {
          for (let i = 0; i < size.width+1; ++i) {
              const x =  i;
              const y =  j;
              const position = this.terrain.getPosition(x, y);
              positions.push(position.x)
              positions.push(position.y)
              positions.push(position.z)
          }
        }
        return positions
      }
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#3

更完善的版本，上面的有点问题。
getIndices (size){

    let indices=[]

    let subdivisionsX=size[0]-1

    let subdivisionsY=size[1]-1

    for (let row = 0; row < subdivisionsY; row++) {

      for (let col = 0; col < subdivisionsX; col++) {

          const useg1 = subdivisionsX + 1;

          const a = col + row * useg1;

          const b = col + (row + 1) * useg1;

          const c = (col + 1) + (row + 1) * useg1;

          const d = (col + 1) + row * useg1;

          indices.push(a, d, b);

          indices.push(d, c, b);

        }

    }

    return indices;

  }

  getPositions(size){

    let positions=[]

    for (let j = 0; j < size[0]; j++) {

      for (let i = 0; i < size[1]; i++) {

          const x =  i;

          const y =  j;

          const position = this.terrain.getPosition(x, y);

          positions.push(position.x,position.y,position.z)

      }

    }

    return positions

  }
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